Subject: European tripoint lat & long list<br/>
Date: May 25, 2002 @ 22:19<br/>
Author: Grant Hutchison (&quot;Grant Hutchison&quot; &lt;granthutchison@...&gt;)<br/>
Prev&nbsp;&nbsp;&nbsp;&nbsp;Post in Topic&nbsp;&nbsp;&nbsp;&nbsp;<a href="6569.htm">Next</a>&emsp;[<a href="topic6568.htm">All</a> Posts]<br/>
<a href="6567.htm">Prev</a>&nbsp;&nbsp;&nbsp;&nbsp;Post in Time&nbsp;&nbsp;&nbsp;&nbsp;<a href="6569.htm">Next</a><br/>
<br/><br/>
<div id="ygrps-yiv-303303172">I&#39;ve recently been downloading data from<br/>
<br/>
<a rel="nofollow" target="_blank" href="http://rimmer.ngdc.noaa.gov/coast/getcoast.html">http://rimmer.ngdc.noaa.gov/coast/getcoast.html</a><br/>
<br/>
and extracting and collating international boundary data. This is tricky,<br/>
since the boundary data are stored (at least in the downloaded text files)<br/>
as numerous short segments, up to sixty per border segement. Not all are<br/>
orientated in the same sense, so it takes a bit of effort to pick out all<br/>
the data for a particular boundary and to collate it into a single sequence<br/>
of longitude and latitude coordinates. I&#39;ve also trimmed out multiple<br/>
duplicated datapoints.<br/>
<br/>
I&#39;ve used the World Vector Shoreline (WVS) data for longstanding borders,<br/>
and have assembled borders in the former Yugoslavia and USSR from 1970s<br/>
internal boundary data in the World Data Bank II (WDB). There are bound to<br/>
be discrepancies between the real world and these old data, but I&#39;ve<br/>
uploaded a collated file for European borders (Europe.txt) to the files<br/>
area - the more data the better, in my opinion, provided we are aware of the<br/>
limitations, and this sort of information doesn&#39;t seem to be readily<br/>
available from any other source.<br/>
<br/>
The file consists of a sequence of headers identifying each border segement<br/>
(assembled from ISO digraphs in the usual way), each followed by a long list<br/>
of longitudes and latitudes. When border segments come in two parts<br/>
separated by another land boundary, they are differentiated by &quot;n&quot; and &quot;s&quot;<br/>
or &quot;w&quot; and &quot;e&quot; suffixes in the header. When the land portions of a single<br/>
boundary are interrupted by an arm of the sea (denl, depl, bahr) border<br/>
segments are suffixed &quot;1&quot; & &quot;2&quot;.<br/>
<br/>
Although the lats and longs are provided to a spurious six decimal places<br/>
(10cm!), I think they&#39;re probably only accurate to a kilometre or so - this<br/>
estimate is based on the fact that the line of international borders in WVS<br/>
and in WDB often differ to this extent or more. This causes mismatches in<br/>
tripoints that are defined by a mixture of WDB and WVS data. I&#39;ve left this<br/>
unresolved, simply breaking the WVS border at the closest point to the<br/>
termination of a WDB border. For instance, I&#39;ve broken the old<br/>
Czechoslovakian/Austrian border (derived from WVS) into atcz and atsk<br/>
segments - the position of the break was determined by the southern<br/>
termination of czsk (derived from WDB).<br/>
<br/>
Tripoint data are easily derivable. Below, I give what I think is a complete<br/>
list of 44 European tripoints, together with their longitude and latitude<br/>
from WVS/WDB. I make no defence of their accuracy - I just report what the<br/>
database says, and hope it may be of use or interest.<br/>
<br/>
<br/>
<br/>
Grant<br/>
<br/>
=================================<br/>
<br/>
Tripoint    Longitude   Latitude<br/>
<br/>
adesfre     1.734605    42.502944<br/>
<br/>
adesfrw     1.443304    42.600338<br/>
<br/>
algrmk      20.991854   40.858106<br/>
<br/>
almkyu      20.585558   41.879713<br/>
<br/>
atchde      9.559833    47.539252<br/>
<br/>
atchit      10.482139   46.859257<br/>
<br/>
atchlin     9.541352    47.264673<br/>
<br/>
atchlis     9.620557    47.058738<br/>
<br/>
atczde      13.843980   48.776035<br/>
<br/>
atczsk      16.947743   48.621657<br/>
<br/>
athusi      16.116010   46.872458<br/>
<br/>
athusk      17.161232   48.008913<br/>
<br/>
atitsi      13.719305   46.519846<br/>
<br/>
bahryun     19.039727   44.861367<br/>
<br/>
bahryus     18.455585   42.565795<br/>
<br/>
bedelu      6.133160    50.128398<br/>
<br/>
bedenl      6.024326    50.752950<br/>
<br/>
befrlu      5.834232    49.540516<br/>
<br/>
bggrmk      22.944127   41.335687<br/>
<br/>
bggrtr      26.362292   41.706194<br/>
<br/>
bgmkyu      22.363579   42.320038<br/>
<br/>
bgroyu      22.672481   44.212027<br/>
<br/>
byltlv      26.613330   55.674703<br/>
<br/>
byltpl      23.504141   53.946919<br/>
<br/>
bylvru      28.168035   56.150304<br/>
<br/>
byplua      23.604688   51.527772<br/>
<br/>
byruua      31.783922   52.108027<br/>
<br/>
chdefr      7.590838    47.582669<br/>
<br/>
chfrit      7.046372    45.929910<br/>
<br/>
czdepl      14.831118   50.834502<br/>
<br/>
czplsk      18.851393   49.517488<br/>
<br/>
defrlu      6.368137    49.461310<br/>
<br/>
eelvru      27.371945   57.335523<br/>
<br/>
finoru      28.912129   69.054744<br/>
<br/>
finose      20.562383   69.063544<br/>
<br/>
hrhusi      16.607745   46.476136<br/>
<br/>
hrhuyu      18.904710   45.937244<br/>
<br/>
huroua      22.894550   47.951122<br/>
<br/>
huroyu      20.271082   46.125871<br/>
<br/>
huskua      22.159404   48.398488<br/>
<br/>
ltplru      22.770241   54.383870<br/>
<br/>
mdrouan     26.635625   48.266918<br/>
<br/>
mdrouas     28.217759   45.468317<br/>
<br/>
plskua      22.570100   49.087870</div>